<%@ page language="java" import="java.util.*,grade.*,java.sql.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'Grade.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
    <%!
    public List<Grade> showAll() {// 显示所有的年级
		PreparedStatement st = null;
		ResultSet rs = null;
		String sql = "select * from grade group by id";
		List<Grade> list = new ArrayList<Grade>();
		Grade g = null;
		Connection con = Tool.open();
		try {
			st = con.prepareStatement(sql);
			rs = st.executeQuery();
			while (rs.next()) {
				g = new Grade();
				g.setId(rs.getInt("id"));
				g.setGname(rs.getString("gname"));
				list.add(g);
			}
		} catch (SQLException e) {
			e.printStackTrace();
			throw new RuntimeException();
		} finally {
			Tool.close(st, con, rs);
		}
		return list;

	}
     %>
     <%
     	List<Grade> list=showAll();
     	for(Grade g:list){
     	out.print(g);
     	}
      %>
  </body>
</html>
